Calipers.



J. ZHERDEPP.

GALIPERS.

APPLICATION FILED JULY 26, 1910.

Patented May 30, 1911.

"It "GIRL! PIT-RS cm. wunmanm, D. c.

\ JOHN ZHERDEFF, OF OMAHA, NEBRASKA.

GALIPERS.

Specification of Letters Patent.

Patented May 30, 1911.

Application filed July 26, 1910. Serial No. 573,870.

To all whom it may concern:

Be it known that I, JOHN Znnnnnrr, a citizen of the United States,residing at Omaha, in the county of Douglas and State of Nebraska, haveinvented certain new and useful Improvements in Calipers, of WhlCh thefollowing is a specification.

This invention relates to an improvement in calipers of the class usedfor making outside measurements, and has for one of its objects toprovide a structure whereby the heavy parts or obtrusive handle usuallyemployed at the pivotal end of the .members may be dispensed with.

The invention has reference to a novel means for securing the members infixed relation with reference to each other when ascertaining diameters,which conduces to reliability and accuracy, and includes cer- 2O tainfeatures relating to convenience in use.

l/Vith these and other objects in view, the invention presents a novelconstruction and arrangement of parts as described herein and asillustrated in the drawing, wherein--- Figure 1 is a broken away,edgewise view of the caliper arms when extended, parts thereof being insection; the pivot member, inclosing-cap and disk-nut also being insection. Fig. 2' is a side view of a pair of calipers embodying myinvention. Fig. 3 is a plan view of the adjusting plate. Fig. 4- is aplan or side view of an end portion of one of the caliper members andthe slidable engaging-plate or locking-member. Fig. 5 is a broken awayside or plan view showing the pivotal mounting and adjusting devices ofthe calipers, being a view of the side opposite to that shown in Fig. 2.Fig. 6 is a side view of the pivot member, and Fig. 7 is a view of thesame in lon itudinal section.

Referrin now to the drawing for a more particular description, numerals1 and 2 indicate the respective inwardly curved arms of the calipers,their inner ends being provided with circular apertures 3, the bores ofsaid apertures corresponding to the diameter of the cylindricalbody-portion 4 of pivot-member 5. Pivot-member 5, best shown in Figs. 6and 7, is provided with the threaded aper- 50 ture 6 extendinglongitudinally thereof and opening upon annular recess 7 formed in oneof its ends. It is provided at its end, ad-

jacent to recess 7, with the annular flange 8,

said flange having a finely toothed, serrated 55 or milled edge, asclearly shown in Fig. 6, its

opposite end being provided with angularly formed walls or facets 9.

When assembling the parts, arms 1 and 2 are mounted upon pivot-member 5,said member being inserted within apertures 3, arm 1 of the calipersbeing seated adjacent to flange 8, and as thus described the arms maymove freely while supported upon body-portion 4 of said pivot-member,washer 10 (F 1g. 1.) preferably being employed and seated between thearms, the parts being held together or in operative relation by means ofscrew-nut 11, said nut having a comparatively large, threaded stem 12engaging the threaded aperture 6 of the pivotmember.

Numeral 40 indicates the outer edge of the bracket forwardly from theend of plate 13.

In order that measurements may be accurately taken, certain devices areemployed 7 now to be described.

At 13 is indicated an adjusting-plate pro vided with an angular aperture14: at one of its ends for a seating upon facets 9 of the pivot 5, itsopposite endbeing provided with a post 15 secured by pivot 16 to plate13, said post having a transverse threaded aperture 17. A bracket 18 isprovided, and its base is secured to arm 2 of the calipers by means ofpivot 19, the end of said base being indicated at 18.

At 20 is indicated a thumb-screw supported in the upset arm 21 ofthebracket, and having a threaded connection with post 15, the end ofsaid arm being indicated at 21. A rotation of the thumb-screw will causepost 15, together, with plate 13 to be moved laterally or in a directiontransversely of arm 2. By this construction arm 2 of the calipers isprevented from rotating upon pivot-member 5, exceptthe slight rotatablemovement which it may have by operation of thumb-screw 20, and arm 2 istherefore under complete control with respect to its movements upon itspivot.

In many instances when ascertaining diameters, a slight adjustment ofarm 2 is desired, and plate 13 and its connections provide meanstherefor condueing to accuracy and convenience. In practice, when movingthe arms of the calipers so that their outer ends will be disposed aspecified distance from each other to indicate a specific scale, theoperator, after the arms have been moved to approximately a correctposition, may

then by manipulation of thumb screw 20 make the accurate adjustmentreferred to.

It is understood that plate 13 has a slight swinging movement underoperation of thumb screw 20, and, to permit this movement, post 15 ispivotally mounted upon plate 13, and the base of bracket 18 is pivotallymounted upon arm 2, as above mentioned, since these pivotal mountings ofthe parts are required so that post 15 may move longitudinally of thestem of screw 20.

In order to reduce the weight of the device the middle portion of plate13 may be removed and an aperture formed therein, as indicated at 22.

To the end that the movements of arm 1 of the calipers may be underconvenient control with reference to arm 2, plate 23 .is employed andmounted slidably thereon. This plate is provided at longitudinalintervals with elongated slots 24; suitable screws, lugmembers orkeepers 25 traverse these slots and are secured to arm 1. Preferably thelug-members are provided with flat heads adapted to coverthe slots, andsince the bodies of the lugs have diameters substantially the same asthe width of the slots, plate 23 may have a movement longitudinally ofarm 1, but a transverse movement thereof is prevented. The inner end ofplate 23 is provided with a concaved edge 26, the same being toothed,serrated or milled to correspond with the periphery of flange 8 ofpivot-member 5.

In operation, arm 1 may have swinging movements upon pivot-member 5except when prevented by plate 23. Plate 23 may have longitudinalmovements upon arm 1, subject to the limitations of lug-members 25, andwhen moved inwardly, its concaved, rugose edge 26 may engage the rugoseperiphery of flange 8, and a swinging move ment of this caliper arm willbe prevented. In practice, after the caliper arms have been disposed toascertain the diameter of an object, plate 23 may be moved inwardly; bythis operation arm 1 becomes rigidly secured upon pivot-member 5, andany movement of arms 1 and 2 with reference to each other will therebybe prevented.

. In order that plate 23 may be under convenient control for readilycausing a longi tudinal adjustment thereof so that arm 1 may be securedin a fixed or rigid relation with reference to pivot-member 5 or may bereleased therefrom, certain devices are provided and are now to bedescribed.

Screw-post 27 issecured upon arml, and the elongated aperture 28 isformed in plate 23 between slots 24, said aperture having a concavedlyformed wall 29 formed outwardly inclined, said outward inclination beingin the direction" of the toothed or milled end of the plate. A lug 30 issecured upon the upper side of plate 23 adjacent to aperture 28 andopposite to wall 29 thereof, said lug having an inclined wall 31disposed substantially parallel with wall 29 of aperture 28 andprojecting outwardly to overhang aperture 28.

7 At 31 is indicated a wing-nut mounted upon screw-post 27, and havingadjacent, outwardly and inwardly inclined, peripheral portionsindicated, respectively at 32 and 33; and it will be understood thatwhen the nut is rotated, and thereby is moved in a direction of arm 1,inclined wall portion 33 of the nut will have a bearing upon inclinedwall 29 of theaperture, and will cause a longitudinal movement of theplate, end 26 thereof moving into contact with the periphery of annularflange 8, to cause the rigid or locked relation of these parts. Also itwill be seen that, thereafter, a rotation of the nut in an oppositedirection, will cause the inclined wall of lug 30 to have a bearing uponperipheralwall-portion 32 of the nut, this operation causing a slidingmovement of plate 23 in a direction opposite to that just described,with the result that end 26 of this plate will be released from themilled periphery of annular flange 8.

The device provides a pivotal mounting of strong construction andcomparatively light weight, these features being desirable where thestructure is metallic, the controlling and adjusting devices beingconvenient in use and reliable in operation.

At 34 is indicated an inclosing-cap arranged to have a mounting upon theblank, reduced portion 39 of keeper 11, to overhang or inclose thetoothed end 26 of plate 23. It is provided with an annular, central,disk-like projection 35 upon its inner side adapted to have a seatingwithin recess 7 so that the cap may be maintained reliably with itsperiphery flush with the inner terminal of arm 1.

At 36 is indicated a disk-nut mounted upon the threaded, reducedterminal 37 of keeper 11, whereby the parts relating to the pivotalmounting of the caliper arms are reliably connected.

At 38 is indicated a washer which may be employed, the same being seatedbetween plate 13 and arm 2.

Having fully explained the several parts and their uses, a furtherdescription relating to operation is not necessary.

What I claim as my invention and desire to secure by Letters Patent is,

1. In combination, a cylindrical pivotmember provided with a serrated,peripheral, terminal flange, its opposite terminal being formed withangularly formed facets; a first caliper arm, a second caliper arm, saidarms being mounted upon and normally rotatable upon said pivot-member;an engaging-plate seated upon the first caliper arm and provided with aserrated terminal disposed normally adjacent to the terminal flange ofsaid pivot-member; an adjustingplate mounted upon the second caliper armand having an apertured terminal with walls angularly disposed withreference to each other, said walls being in engagement with the facetsof the pivot-member; means upon the second caliper arm and itsadjusting-plate for controlling the pivotal movements of said arm; meansfor causing longitudinal movements of said engaging-plate, its serratedterminal during one of its movements engaging the serrated flange ofsaid pivot-member.

2. In combination, a pivot-member provided with a serrated peripheralflange; a first caliper arm, a second caliper arm, said arms mounted andnormally rotatable upon the pivot-member; means for preventing arotatable movement of the first caliper arm, said means comprising anengaging-plate seated upon said arm, said plate being provided with aconcaved, serrated, terminal normally disposed adjacent to the flange ofthe pivot-member and formed with an aperture having a wall inclinedoutwardly in the direction of said serrated terminal, a screw-postmounted upon said first caliper arm traversing said aperture, abearing-nut having an inclined annular wall portion adapted to engagethe inclined wall of the aperture of said plate, the operation beingthat a rotatable movement of the bearingnut causes the serrated terminalof the engaging-plate to make contact with the serrated peripheralflange of the pivot-memher; and an adjusting-plate mounted nonrotatablyupon said pivot-member, said adjusting-plate being connected with andhaving devices thereon for controlling the pivotal movements of saidsecond caliper arm.

3. In devices for the purpose described, a cylindrical pivot-memberhaving a longitudinal, threaded aperture and formed with a terminalrecess and a transverse flange outwardly of said recess; a pair ofcaliperarms pivotally mounted upon the pivotmember and normallyrotatable thereon; a detent plate provided for and connected with eachof said caliper-arms, the detentplate of one of said arms having amounting upon the pivot-member, the detent-plate of the other caliperarm adapted to make contact with the transverse flange of saidpivot-member; a recessed inclosing-cap disposed to overhang thetransverse terminal flange of the pivot-member, and having an annularprojection upon its inner side adapted to have a seating within theterminal recess of said pivot-member; a screw member engaging thethreaded aperture of the pivot-member and traversing the inclosing-cap;and a disk-nut mounted upon the screw member and disposed within therecess of inclosing-cap.

In testimony whereof I have aflixed my signature in presence of twowitnesses.

JOHN ZHERDEFF.

Witnesses:

I-IIRAM A. Srunons, MIKE LEHONIN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

